1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kkurt [141]
3 years ago
11

What is not changed when work is done by a machine?

Physics
2 answers:
den301095 [7]3 years ago
4 0
B) The amount of work done
maks197457 [2]3 years ago
3 0
Your answer is B
hope this helps
:):):):):):):)
You might be interested in
A 200-N woman is standing on a concrete floor. How much force does the floor exert on her?
lisov135 [29]
C.........................
6 0
3 years ago
Answer the following questions
kiruha [24]
I ueueeieueueuekdududieisidudud
4 0
3 years ago
Read 2 more answers
Two people stand facing each other at roller skating rink then push off each other
9966 [12]

a) 0 kg m/s

b) 0 kg m/s

c) +3 m/s

d) 60 N

Explanation:

a)

The momentum of an object is a vector quantity given by:

p=mv

where

m is the mass of the object

v is the velocity of the object

In this problem, we have a system of two people, so the total momentum will be the sum of the individual momenta of the two people:

p=p_1 + p_2

Which can be rewritten as

p=m_1 u_1 + m_2 u_2

where m_1,m_2 are the masses of the two people and u_1,u_2 their initial velocities.

However, the two people are initially at rest, so

u_1 = 0\\u_2 = 0

Therefore the total momentum is

p=0+0=0

b)

The principle of conservation of momentum states that when there are no external forces acting on a system, the total momentum of the system is conserved, so we can write:

p_i = p_f

where

p_i is the total momentum of the system before

p_f is the total momentum of the system after

In this problem,

p_i = 0

As we calculated in part a: this is because the total momentum of the two people before they push off each other is zero.

Therefore, according to the law of conservation of momentum,

p_f = p_i = 0

So the total momentum is zero also after they push off each other.

c)

The total momentum of the girl and the boy after they push off each other can be written as:

p_f = m_1 v_1 + m_2 v_2 (1)

where:

m_1 = 30 kg is the mass of the girl

v_1 = -5 m/s is her velocity (she moves backward, so the negative sign)

m_2 = 50 kg is the mass of the boy

v_2 is the velocity of the boy

As calculated in part b), we also know that the total momentum of the girl and the boy is

p_f = 0 (2)

By combining eq(1) and eq(2) we get

0=m_1 v_1 + m_2 v_2

And solving for v2 we find the velocity of the boy:

v_2=-\frac{m_1 v_1}{m_2}=-\frac{(30)(-5)}{50}=+3 m/s

and the positive sign means he is moving forward.

d)

We can solve this part by applying the impulse theorem, which states that the change in momentum of an object is equal to the product between the force applied on it and the duration of the collision:

\Delta p = F\Delta t

where

\Delta p is the change in momentum

F is the force

\Delta t is the time during which the force is applied

In this problem:

\Delta t = 2.5 s

For the boy, the change in momentum is:

\Delta p = m_2 (v_2 - u_2)

And since

m_2 = 50 kg\\u_2 = 0 m/s\\v_2 = 3 m/s

We have

\Delta p = (50)(3-0)=150 kg m/s

So, the force exerted between the boy and the girl is:

F=\frac{\Delta p}{\Delta t}=\frac{150}{2.5}=60 N

8 0
3 years ago
What is the velocity of a 0.8kg ball that has a momentum of 3 kg*m/s?
Marysya12 [62]

The velocity is 3.75

5 0
3 years ago
A worker pushes a box with a horizontal force of 40.0 N over a level distance of 4.0 m. If a frictional force of 27 N acts on th
Lorico [155]

Work = (force) x (distance)

The worker does  (40N) x (4m) = 160 joules of work.

Friction eats up    (27N) x (4m) = 108 joules of that energy,
                                                         generating 108  joules of heat.                         

The remaining    (160J - 108J) = 52 joules of energy moves the box.

7 0
3 years ago
Other questions:
  • Someone help me , is it qualitative or quantitative.
    11·1 answer
  • To keep the calculations fairly simple, but still reasonable, we shall model a human leg that is 92.0 cm long (measured from the
    9·1 answer
  • What is the following atmospheric property associated with?
    5·1 answer
  • Akio draws the ray diagram shown.
    15·1 answer
  • The index of refraction for flint glass is 1.5. This means that
    8·2 answers
  • What if the Earth was moved out to Jupiter's orbit which is about 5
    6·1 answer
  • NEWTON LAWS
    11·2 answers
  • What is theory of kinematics ??<br><br>this question hasn't been asked lol -,-​
    10·1 answer
  • Scientists might live too far away to meet face to face. What are the three other ways they can share data and discuss evidence?
    9·2 answers
  • Answer the Question Correctly and get brainliest and thank you
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!